Solve for w
w=11
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21w-9=-\left(-3w-189\right)
Use the distributive property to multiply 3 by 7w-3.
21w-9=-\left(-3w\right)-\left(-189\right)
To find the opposite of -3w-189, find the opposite of each term.
21w-9=3w-\left(-189\right)
The opposite of -3w is 3w.
21w-9=3w+189
The opposite of -189 is 189.
21w-9-3w=189
Subtract 3w from both sides.
18w-9=189
Combine 21w and -3w to get 18w.
18w=189+9
Add 9 to both sides.
18w=198
Add 189 and 9 to get 198.
w=\frac{198}{18}
Divide both sides by 18.
w=11
Divide 198 by 18 to get 11.
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